Add PortAudio

Issue in enque/deque when play in second time.

Author: Cuda-Chen

.gitmodules

@@ -6,3 +6,7 @@
     path = mini-gdbstub
     url = https://github.com/RinHizakura/mini-gdbstub
     shallow = true
+[submodule "portaudio"]
+	path = portaudio
+    url = https://github.com/PortAudio/portaudio
+    shallow = true

Makefile

@@ -70,8 +70,9 @@ $(call set-feature, VIRTIOSND)
 ifeq ($(call has, VIRTIOSND), 1)
     OBJS_EXTRA += virtio-snd.o
 
-    LDFLAGS += -lasound -lpthread
-    CFLAGS += -Icnfa
+    PORTAUDIOLIB := portaudio/lib/.libs/libportaudio.a
+    LDFLAGS += -lasound -lpthread $(PORTAUDIOLIB) -lm -lrt -lpulse
+    CFLAGS += -Icnfa -Iportaudio/include
 
 cnfa/Makefile:
 	git submodule update --init cnfa
@@ -80,7 +81,12 @@ cnfa/os_generic: cnfa/Makefile
 CNFA_LIB := cnfa/CNFA_sf.h
 $(CNFA_LIB): cnfa/Makefile cnfa/os_generic
 	$(MAKE) -C $(dir $<) CNFA_sf.h
-main.o: $(CNFA_LIB)
+portaudio/Makefile:
+	git submodule update --init portaudio
+$(PORTAUDIOLIB): portaudio/Makefile
+	@cd $(dir $<) && ./configure
+	@cd $(dir $<) && $(MAKE)
+main.o: $(CNFA_LIB) $(PORTAUDIOLIB)
 
 # suppress warning when compiling CNFA
 virtio-snd.o: CFLAGS += -Wno-unused-parameter -Wno-sign-compare